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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '916427dd22cd14163c737e52407d7763f6f8b873466d760c3393ebe3719b7554' 
  AND token = 'U8oFQOge99Ay7MaX9n+4EGgCScnhVFW5rs3+Xp97COA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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