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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6423a6764a08c8643848304d2c1d1d41de83abcd2e8862613923d90b5d210788' 
  AND token = '6A2YjRDuX8I0J6vStt9MCisRnbBm1n7DBje0TuF8uAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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