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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f6688ba2594d18e5c34d3f51c546bd361285cd5a8dbdd77758c15e86652b3af' 
  AND token = 'F+r0JCtM7bS8z96/DOcKgb3V1nbi0KAKVLKAUATKyLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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