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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a1d46421a6ae3b2b96ac51b40653b990e045825ea339f2b48db6ebfd0cc4bc4b' 
  AND token = 'iaiI7UE+IVk2N5JG0Ozmsr3hQiqPCbvcYpwiSM5X6FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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