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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8c2bd6c87cb88a228702cd2c47b149acb3995946c4fad3a789126bdd8533fe4' 
  AND token = 'CF0o9w8HNc2CssVu9tM2QJDB6wSuLYXCH8dGWacLhnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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