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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ede8c2bda55329e11da8ac89d1421b69689b596eda5681f68d7e11e3503efa3' 
  AND token = 'f6Oknva0D9wv51GzJh8JfxPt4id2ytEL3E/YjkgCrGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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