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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab40052b1e909f46f0325b91682142b182c90117a64cfe351b1153b7d3ba7e14' 
  AND token = 'rX52wCqb02UAaTVq+9WK5O//n7Icfmp8QC0SfBQOckk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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