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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '576053084d18b88f76b90ef3b9da8233368a898fed53bf535cde191c094ecc73' 
  AND token = 'tD3z7+UkchKu1qydvzr5upAL+ImRbbZdcw2ulfyNh+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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