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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06f647c5aefaa6518d83e9fe7a4e0fef38c38be30ded9ad8239ec003cea8a25f' 
  AND token = 'JCnI9tIvVz1j0hRPTlsPIFL6GVrJlrN0x9kt7LV7WQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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