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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82477861b2f2dba5b9a5784c6ec76aa0f87979e7af9708e065a585855eb5534a' 
  AND token = 'a/a0H/eKiQ/NsSpQSegS7Us5p0ihLNepkLX2HwQxt1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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