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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3717b01f39d452604d8fae018b6f5deca50a82951ccad86baea177b25da4af4' 
  AND token = 'KezqmO+PaabQWLePbIcRjH/5ShzXvyxdakGGf+NtUa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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