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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ea2c0153c8d91c7471dc4e606f2886272c7185d28e23808776193f2dbc537cf' 
  AND token = 'u5taOVZbJTACvTxV58oTpOjvGudUexhI3Zx/Thfko/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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