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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5291f4ab922e9c20b1e3146e4a78fd2e6fb6c2f5f6b0287281a45df2d96b150f' 
  AND token = 'P5OyBLXM9nXCcpQeTIG7gISzJl/cD7Oe/qFW748bDzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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