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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94fd43f98958f45384a9af1c0e2a67fefd8472b4f5acb2100afe0cfa215f5e5d' 
  AND token = 'zou9Def7Fop5M0TMcqHXVK+GiBmYIfwQfBpf3pg7yoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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