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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '422328c0f44ec62564ccfbcbbc5b784dde7ab3097ad6dd7ce77b0c581aa9eca3' 
  AND token = 'SLL0qjpK4+o8ASt9cuy6Nu4AtxCCijuNPr9f+IzaVFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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