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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c0471081cf81a1c7067920429211407b91e2ced9def63b434642c307be9c056' 
  AND token = 'yLR32ygLbP/8O4yIpey3O8MqqtjnWfio200GJQAM5FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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