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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd77a9bfe617cbae20f82e109e390f73e217c6b73a0d19426fd3d1d7f8fd90a7f' 
  AND token = '60hbLN6DpnqjFg14VRIXZGECkoLBbN6HxhnzjS9aLFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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