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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e8281d68d0e693f2d1e32f03be99a2eaa036d3ed2d90cf051d48eec640399b8' 
  AND token = 'UCa2947OmlXbMdRC11V8z75N2tQ7aZyKqb7BAwXUdIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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