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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5b35203a79e7085fe95cbd45a09474c297606841e54b06dea35ed41c5abde53' 
  AND token = 'sAcaLBPMilYE63rJh8BKsSUuYKzZR9QtiwvBsWL8OSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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