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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cdb3375c7fa08a04a95f67ce62faa3bff2c9902b71ea3b5048488d0a2ef91963' 
  AND token = 'asXhn7eBuSK6O49iaL5ICMxgGKACsVkOZKTpf7buRlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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