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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9307c86a7d2ca51ecd7af5480757236a3cfb076c4d04f25991cdcfb48d88250b' 
  AND token = 'MGC0N5dGp4syEkpQaA1zmE+D+isWitOYkqChd6qKVTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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