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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7fb6f676dafb45935ee9798c9f9cf35a134c313385bc751b52e34a642fae26f2' 
  AND token = 'TvCPYfExki2OFtn8GtyVP3UymZ84fHXtH22oQ7pk4p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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