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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ef1608c94d50011d94e075ad406158cd607d1fc8ef199eed03bf0d239c1a559' 
  AND token = 'cxTdmnnBglGwb5beA4JxB5G3oOmgSR8Jg6ShkIkDIXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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