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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa5f8caaf79b04b5252f3621a4583dd28586aed03c58ea4a311782228985753e' 
  AND token = '8YAlISf8Ajw4dgUTHi5yd+9irQEApwiq3tpT7atG4QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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