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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4a51ee01fb3409efcb26fa896ff5c3d236d237bc1ef724d9545f033a8ab3f22' 
  AND token = '4PvtnApJT2T4Xb4nc2URQ4nxFw6Jbbl4xojZIGxx/uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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