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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76e75c2e360f2dfe997063ee9782d81c7fcf15a5487339963a5cc12e1150bd04' 
  AND token = '6qBxP2mLy1DxnlHuqg0e4CLuIMWyql43ey3ftrP6mzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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