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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a56b38b3210f3b8d0dfe6ec6d22fa2a7b112f0ed59b3f81eec18194b2050e32c' 
  AND token = '99Mq1wdcZt5ouv8372a2ZAn7SvS/Dk6ghsrmvDJveCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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