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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'beaba51daa488c50290da42b05efa04ec0065ce26fa473ad3800e2df9c5589f5' 
  AND token = '9xUepcorpf9ftJtyhP/O01GZOzaZs11oXPLE7Nd6nns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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