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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'badc22bf2dbfa7cd3296eacd103cfe53ad4313249f82eec315ca2b6f34d3d4fe' 
  AND token = '2W4Nwk/+onCyeN6Rmxr9axmLGx8TvKsE1sQYE8NLLQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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