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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aee459783e02ff508021b948ea489ca5682220b1f5e84890f27d303990f34644' 
  AND token = 'vI75XXXO7pVLM+JFF8NhCbBZF1K0sZfpr5mt61pAL0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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