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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f082402a5c1f045f637fc641ca6232e5571aa3fb114235ea72b0af3eaa802f2' 
  AND token = 'KqDvyXhxry2idH/+Z1xTooUI3oi0AX8MNq9evH5PWIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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