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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e34c3c0ff27a175b9525c9e0facbe0dbb634386b356dc86aa100f2f9fc0cdce' 
  AND token = 'O/7m5i8AVMq0w5v/Xt9QgDE02IGx19O9XS4r/E+lHCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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