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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23b0e9349dc7173c296cae662c8a09f3b4c036aa3a20a8e59f2ec1f6dd42d126' 
  AND token = 'RoOLSIzhHx874Kmg5k28ekchtX/ob6BBuQ1Z2tLiukU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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