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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8637c46d112f4158e4d1c4d8cbd9046e4e6c746fa0267e968c5db16d97b58d3' 
  AND token = 'mQdFuSvMKT3UR0obyxHzH4VxNZiFcov4ajJHsjGtLew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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