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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69579cf4502ed252efb78c720a413ff66aacfc545a560be75d88acbb0cddf1fa' 
  AND token = '8mRro2nqKdEA/3YBb31lyfyKJcjLrCu1MYYe2VTu2Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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