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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b6fb3835d0a598411d6bb359248b1c7f1452cd3b674f107cec36d25b5c52eb9' 
  AND token = '6cGuvnR/S2q1FmRc29m82hxqvaYkUdGMdOIh5LuqqTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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