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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7ce06a338d711185d95d99bb9f2b10abe31f9f6cdd3acba1d74dba68a931fda' 
  AND token = 'rORfPFcZ6YvZDfNUU997OaFV/G0DJ93ow7luegYpwBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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