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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e16c8511fbde398409e42492cfaf7c2e3ea084c791e53f4b1031618659e476b5' 
  AND token = 'BZ6K/qSxp7BAi0nAb98KbSp5ANaAiJHD7UaCuKPLbCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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