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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '634aa54d21d1e399859d335a025d5e130c70e53c898ee360f99a7cf35b9fdf9d' 
  AND token = '7dtjnvNU05CflOtOroCoekPg3PfsptD7N4KQFhBpLAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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