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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63e7a3bfd40e20af5b982367cc4975df7d1e6ee92823a6b68c2d8b4ded7724db' 
  AND token = '3Zs6yDQzdMiYBqqYibebWPIIhBFdNdRxdXY76S6ZXbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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