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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea443b1c6c336282c2845efb86377eddfe5e75e60a5661f7fbc1afea78d5dfd5' 
  AND token = 'LVeGWzVU+Q5udswCpacbQrESqHQtKo8ra8KY472ZNbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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