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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3e8cd0230e1117d398692002aca12f7837e133423dccbc5b86d1ad92b5282ae' 
  AND token = 't+OeV8eTL5Q13WZK7PSQYCFoSJYl/PLhneozFebXOjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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