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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a4eb9bcc315578fd93ac75b7f149f6c94731b35b65363e6bad2381a16486e08' 
  AND token = 'kzUueuPt+NcNw/IdFwggaDu9kTjnd/QD0ozXelCea/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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