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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01d02cb21f78bc45d4b8f23e93bff85cf8cc92882cefe3431dcb9300b0749a51' 
  AND token = 'FdrdGYUb4dDUUn4H2+u739SO4AKs4C29Rk3M6Il0v8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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