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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c87479da86e90111500fd8c5d1901753daafb373d3db5078f6e13a1e0228736' 
  AND token = 'Drobyxgjz/EJMuSpN+duSmidV0Q0UT1zPpx2shHM2r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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