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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8848160e3c80ea5c90186b3ea3df4a28fd766918ce83a4d3ac1062ccf429ce35' 
  AND token = '+mldT2l57MZ7+PKBed+5u8xKnaLeBZf2tOuWv7XM/Ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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