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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f01afdb2e3261e92ee350fa4e60ffc0fe2d5b3dfd119d3009ecb7b7852bf8d6' 
  AND token = 'wm9DpBY7622nLGtCBn3Un3AXEmZi2d+Zak2nc6o5uAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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