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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64f38d1b51c848b8dd663904190855d5846d59fe8a23e4e33262d7fe52e4c797' 
  AND token = 'DyIEMwVH+QE0j9qy9r9eAGtDVdNiu5WJH8JRma5khk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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