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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2695bb5adb83fb2a24f77cde0ef003142d3388eeda871db09d16bba91ad259d1' 
  AND token = 'UtDw7fTWO6GHTjuQityJW0lbjKUNI7lifr6HZo1a2Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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