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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '569bbbe19a177a894f987a251778f230e80021d30d54aa0e22db0a061a316a04' 
  AND token = 'lJAnHjzIHKKKKecLRQ491tL+0F/Xzfp+yoz09q9tGfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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