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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da52e3296292420431c69a5a2f6ef205eac40450fa6992ba4fc3ab2d69b4a603' 
  AND token = '04a5siCta36fmeeVIyBYJmC57AZw68OVtCU8lGOZHSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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