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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8e07f422f9d73262fc96e4b399ae52b3f1c5f715aae1307957ff21021fd6ddb' 
  AND token = 'Me7BvJWhZNpmH7WxNyo2smogy3rmzYy56NI3jkCfPak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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