SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0eb44bfbff9ee791d586ea8cfe538fcf37d0244d9948a13416b396c8a0845a3' 
  AND token = '7P+1mIzEwOgmG6oc+WK1Ab52CAaI6T5HhQ7UXFKIlys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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