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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a5fd956218ca41e3d058fecaf85851e50ce07e59b50e2ae6456c68c20e9e2a9' 
  AND token = 'GZjKxtlB+Q60zdRaskgN6urV3K+epEKkK4qEf6B5EVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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