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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cdc493f6003060b1472a7af919f22f022ae81fe18d6a7c4954d57ca64ee2e01b' 
  AND token = 'KShfgyDMY6cH5Us1N8WgkqTu3qaIDBWWLcMVC7NUs5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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