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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8d5c691defdc375eee8ad0e34e11fce6cb62a3b3378e8138eace18c9be14fcf' 
  AND token = 'bxoF/2mV9kvRP0n9pOiVqA+ePoFEPWcpH08O3GEQmI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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