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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8b41b58f880c5d8250c6b37bcda75e2c0df28bfed12f82d6dd1409c0d7243e2' 
  AND token = 'EJfqCaEHnND/2dHPGAeiheahbAGQlq7kq2xNIKNF5Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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