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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56839f0c9ca7eba284022aa67e0a6a41caabf5c45bacb9917ac108c5e89bc4d6' 
  AND token = 'CqCMFtrEtg/A4RiGCdBD0ye4yhoXpmYJAU50OriwAqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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