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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97dabd558663dfa10475b3a2570de9dc090e8547148be22a507396e1b94142cf' 
  AND token = 'gN3jWFbkUfb1DRC7CajnFT2r6NQDpomo0/ij2S1ro0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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