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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cadf29588de1f4576eb2f53aeef913d44411bbba11c11b56b8aab8440e8312cd' 
  AND token = 'p4tvfDQg1R39YvwLUBnRepY3wVuyeMJUXbk11YYA1vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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