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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3835734c484f9ef8d5240d7900ccfac6e9126f27d18d8500d40af4b27231fadd' 
  AND token = 'IqyopleXYthkR7LDjISSbCGqz7E5ZbUelLuly6n0E+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}