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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2662b97e4aae12d2616164cd50ef687e6e26ad29baf71ad20e50b13b3ef01d3' 
  AND token = '/Pvy1Ke1IxkOfF9xN0sdQF9GO22zbQUmPagqeDlHMDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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