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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6797bf285fa5740c10fbe37cb4fe89eed7b0d7d002e7ea05f3168f7498061bf3' 
  AND token = 'V1MB7VpaF67VDg554QDN3NdZeavzJwGsJxl9bS7tSLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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