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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8401369bb36ae1c1a48257b8e28aa8ab6f1d98c0d81c6e4ebc164f1359553d6' 
  AND token = 'l62ZvzKnB5Y84bedsQn/vH/sk2JitFQT2EUvNwkXes8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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