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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d6cf6983763b803f39e68dd8f8ce8963a1814c0ef61b256a1e7ac042dfd1bb4' 
  AND token = 'JL5lW73yQfZjjq3wJ9KSuWIHp8K6/eHqUweZariNIaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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