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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5bdb14db074e2ec61ffc57ed2ba68e8165f18ee7e0ab402bf667f9a8484b2413' 
  AND token = '7lW3AVWk/Fv+LE9Uq8+rPxhV2O8SOr6wWr8D4IpJkRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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