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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c0862ef138a8fa595e54fd7c3b735bd22fdccdeac9ab9e1366b7b68300a10f0' 
  AND token = 'qmw5YKfXcW1DehGZGiiw+0j0l1NnY3g9HwMLN51aov0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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