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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92191d871848ace69718b095f0436127d1eed2084c1e6fef10a40caa38b4948a' 
  AND token = 'AUaJ1YSiTWiNY8WotsrrG00hHejEMugadWoslcF8bTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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