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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70cd5386c6df86a9b55fbac6f7609731551eef33eb6fc37c9832c80de1378308' 
  AND token = '+QSbGntrSdGAHYIvVNTaAf40z8pyI+FxAZXeJTR6hSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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