SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6010a6a3b50f5f6c7e078efb789144961eec9787a14d3a0acfdd22945a62d0d' 
  AND token = 'OwAKGdXuHRmfsBV0PN5Z0PIyTUng+8nVIRswhPyV5Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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