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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a68bf8e59140f213e1c15bb9ae1f186ad345d03687ad2f9f0664f9f5b749eb59' 
  AND token = 'OHrHqrg43r3kboH81w/snHGwYMDD8z9RdYnT/Hxk/00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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