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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2b671684becaf9049c3fd8132dece80b5c40de256b2bbbdc2c00c8fd8473967' 
  AND token = '2lnuDtc0qT5NFK18XPvGAD7RmCthDdYU4MlFsgIM42Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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